Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK FOR AN ACTIVE DTC
1. Ignition on, engine not running.
2. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK FOR OTHER DTCS
1. Refer to the recorded DTCs.
  Are there any Fuel Quantity, Fuel Rail Pressure, EGR, Crankshaft Position, or Camshaft Position DTCs active or pending?
  
  Yes
  - Repair as necessary in accordance with the Service Information. Refer to 3.0L DIESEL - DIAGNOSTIC CODE INDEX .
  No
  - Go To 3
CHECKING ENGINE FOR A KNOCK
1. Start the engine and let idle for one minute then operate engine under conditions in which complaint(s) occur.
2. Listen for an engine knock.
  Is there a knock present?
  
  Yes
  - Go To 4
  No
  - Replace the Fuel Injector. Refer to INJECTOR(S), FUEL, REMOVAL . If this DTC was accompanied by a Crankcase Pressure Sensor DTC, damage to the cylinder may have occurred.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
CHECK THE FUEL INJECTOR FOR A LEAK
1. Continue to run the engine at idle. Using the scan tool, perform the Injector Kill Test for the cylinder in question.
  Does the knock go away?
  
  Yes
  - Replace the Fuel Injector. Refer to INJECTOR(S), FUEL, REMOVAL . If this DTC was accompanied by a Crankcase Pressure Sensor DTC, damage to the cylinder may have occurred.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Diagnose the engine for a mechanical failure.
  - Perform the PCM VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .